Children typically start losing their baby teeth around age 6, though it can begin as late as age 7. The first to go are almost always the two bottom front teeth, followed by the two top front teeth. This process is completely normal and makes room for the 32 permanent teeth that will eventually replace them.
If you’re an adult wondering about permanent tooth loss, that’s a different story entirely. Permanent teeth aren’t supposed to fall out at any age, but gum disease, decay, and other factors cause millions of adults to lose them starting as early as their 20s and 30s.
The Baby Tooth Timeline
Most children lose their first baby tooth around age 6, starting with the lower central incisors. The process then follows a fairly predictable pattern: upper front teeth come out next, then the teeth on either side. The baby molars toward the back of the mouth are usually the last to go, often hanging on until age 11 or 12. By around age 13, most children have a full set of permanent teeth in place, with the exception of wisdom teeth.
The timing varies from child to child. Some kids lose a tooth at 5, others not until 7 or even 8. Girls tend to lose their baby teeth slightly earlier than boys. If your child hasn’t lost a tooth by age 8, it’s worth checking with a dentist, but a year or so of delay from the average is nothing to worry about.
Why Baby Teeth Fall Out
Baby teeth don’t just randomly loosen. The process is driven by the permanent tooth developing underneath. As the adult tooth grows upward, it triggers specialized cells that gradually dissolve the root of the baby tooth above it. This root resorption process works through the same biological signaling system the body uses to remodel bone. The permanent tooth’s surrounding tissue releases chemical signals that essentially tell the baby tooth’s root to break down, bit by bit.
By the time a baby tooth feels wiggly, most of its root has already been absorbed. That’s why lost baby teeth look like hollow little shells rather than full teeth with long roots. It’s also why losing a baby tooth naturally involves very little bleeding or pain.
When Baby Teeth Come Out Too Early
Sometimes children lose baby teeth well before they’re supposed to, and this can cause problems. The most common culprits are tooth decay, dental injuries from falls or sports, and poor oral hygiene. Decay remains the leading cause of premature baby tooth loss. The baby molars are especially vulnerable because they emerge between 16 and 29 months of age with deep grooves on their chewing surfaces where cavity-causing bacteria thrive easily.
Losing a baby tooth too early matters because baby teeth act as placeholders. They guide the permanent teeth into the correct position. When a baby tooth is lost prematurely, the surrounding teeth can shift into the gap, potentially crowding the permanent tooth that’s trying to come in later. This is one of the main reasons children end up needing braces.
Permanent Teeth and Wisdom Teeth
Once the baby teeth are gone, the permanent teeth are meant to last a lifetime. Most of the 28 permanent teeth (not counting wisdom teeth) are in place by age 13. Wisdom teeth, the third set of molars at the very back of the mouth, are the last to arrive, typically emerging between ages 17 and 25. Many people have their wisdom teeth removed because there isn’t enough room in the jaw for them to come in properly.
Adult Tooth Loss by the Numbers
Permanent teeth aren’t designed to fall out, but they do. Adults between 20 and 64 have an average of 25.5 remaining teeth out of a possible 32, according to data from the National Institute of Dental and Craniofacial Research. That means the average adult in that age range has already lost about 6 or 7 teeth.
The losses accelerate with age. Adults aged 20 to 34 have an average of 27 remaining teeth. By ages 35 to 49, that drops to 25.5. Between 50 and 64, it falls to 23.4. Among adults 65 and older, about 15% have lost every single tooth. That rate climbs to nearly 20% for those 75 and older.
Certain groups face significantly higher risk. Smokers, people with lower incomes, and Black adults all have fewer remaining teeth on average. Smoking is one of the strongest individual risk factors for tooth loss because it restricts blood flow to the gums and accelerates the breakdown of bone and tissue that hold teeth in place.
What Causes Adults to Lose Teeth
The two main drivers of permanent tooth loss are gum disease (periodontitis) and untreated decay. Gum disease is the bigger threat as people age. It starts as gingivitis, the mild inflammation you notice when your gums bleed during brushing. Left unchecked, it progresses into periodontitis, where the infection moves below the gumline and starts destroying the bone that anchors your teeth.
Periodontitis is classified in four stages based on severity. In the earlier stages, there’s manageable bone loss and shallow pockets between the gums and teeth. By stages III and IV, bone loss is extensive, teeth become loose, and some may need to be extracted or fall out on their own. The progression from early gum disease to tooth loss can take years or even decades, which is both good news and bad news: it means there’s a long window to intervene, but also that people often ignore the early warning signs until serious damage is done.
Keeping Your Teeth as You Age
Tooth loss in old age is common, but it’s not inevitable. Japan’s “8020” campaign promotes a goal of keeping at least 20 natural teeth by age 80, and research supports why that number matters. Maintaining 20 or more teeth is linked to better cognitive function in older adults and greater physical independence. People with fewer than 20 teeth who don’t use dentures have a higher risk of falls, though wearing dentures brings that risk back down.
Regular brushing has measurable protective effects beyond just preventing cavities. Studies show that consistent tooth brushing at least partially offsets the increased risk of physical disability that comes with having fewer teeth. The basics haven’t changed: brushing twice a day, cleaning between teeth daily with floss or interdental brushes, and getting professional cleanings. What changes with age is the stakes. Gum recession exposes tooth roots that are softer and more cavity-prone than the enamel-covered crowns, so older adults often develop cavities in spots they never had problems before.
Dry mouth, a common side effect of many medications prescribed to older adults, also accelerates decay by reducing the saliva that naturally washes bacteria off teeth. If you notice persistent dryness, it’s worth addressing, since saliva is one of your mouth’s primary defenses against both cavities and gum disease.